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DC Generators

DC Generators
A triplex wave winding will have parallel paths.

4
6
None of the listed here
2

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DC Generators
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except

Compensating winding
Interpoles
Dummy coils
Shifting of axis of brushes

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DC Generators
In a lap winding, the number of the brushes required is equal to

Commutator pitch
None of the listed here
Number of poles
Number of pairs of poles

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DC Generators
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

increase the speed of primemover
check armature insulation resistance
reverse the field connections
increase the field resistance

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DC Generators
The main factor which leads to unstable parallel operation of flat and over compounded generators is

unequal speed regulation of their primemovers
their rising voltage characteristics
unequal number of turns in their series field windings
unequal series field resistances

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DC Generators
_____ together are called stray losses.

Field copper loss and iron loss
Iron and friction losses
Frictional loss and copper loss
Copper and iron losses

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